781N Electric Latch Pullback Controller Installation Instructions

Transcription

1 781N Electric Latch Pullback Controller Installation Instructions INSTALLATION For C-UL Listed applications, the unit shall be installed in accordance with Part 1 of the Canadian Electrical Code. Transformer model BE by Basler Electric and transformer model by Galaxy Transformer and Magnetics have been certified for UL and C-UL applications. Transformer model A A34 by EWC has been certified for UL applications only. The 781N enclosure should be securely fastened to the wall using the four 1/4 inch diameter mounting holes located in the back of the box. Position the enclosure so that the transformer is located on the left-hand side. The 781N must not be installed outdoors. For the 120VAC power input, terminal block TB1 will accommodate up to 12 AWG wire (solid). Conduit must be used to provide an adequate earth ground to the enclosure. NOTE: The maximum input current is 750mA. The 781N is designed to be used with electric latch pullback exit devices. Use the chart below to determine the correct wire gauge per given length of two-conductor cable that will be run from the 781N to each exit device. Do not exceed the maximum length listed with each wire gauge. WIRE GAUGE MAXIMUM LENGTH OF TWO-CONDUCTOR CABLE 16 AWG 40 FEET 14 AWG 60 FEET 12 AWG 100 FEET Up to two devices can be used with the 781N. If only one device is to be used, wire to the "DEVICE ONE" location at TB3, terminals 5 and 6. NOTE: Be sure to observe polarity when connecting devices 1 and 2 to TB3. (Refer to the wiring diagram located on the lid of the controller.)

2 STANDARD OPERATION The 781N provides a choice of two methods of electric latch pullback: Single System or Dual System SINGLE SYSTEM LATCH PULLBACK This method allows one input to control two devices sequentially. A momentary switch closure across terminals 1 and 2 of TB3 will pull back DEVICE ONE first, followed by DEVICE TWO. Use this method for single door applications or on a pair of doors using a device on one or both leaves. The 781N comes from the factory already set up for this method. DUAL SYSTEM LATCH PULLBACK (OPTIONAL) This method allows independent control of DEVICE ONE and DEVICE TWO outputs by their own separate input. A momentary switch closure across terminals 1 and 2 of TB3 will pull back DEVICE ONE only. A momentary switch closure across terminals 7 and 8 of TB3 will pull back DEVICE TWO. No more than one device can be used per output. Use this option for applications requiring two single door systems or two pair door systems using one device on the active leaf of each pair of doors. To change over to the optional dual system latch pullback, move the program jumper PJ1 from between the middle post and the end post, marked "S" (Single System) to between the middle post and the end post, marked "D" (Dual System). NOTE: When using the optional method, DEVICE ONE and DEVICE TWO can never be activated at the same time in the event that both input switches are actuated simultaneously. If this should occur, DEVICE ONE will always activate first, followed by DEVICE TWO. When using a momentary, normally open switch for activating latch pullback, adjust pot R2 (for DEVICE ONE) or pot R4 (for DEVICE TWO) on the p.c. board to the desired latch pullback delay time from 1 to 20 seconds. Turn the pot clockwise to increase the delay time. When using normally open contacts from a keypad or card reader ( with built-in time delay) or a maintain switch, turn pot R2 (or R4) fully counterclockwise to the minimum delay time (approx. 0.5 sec.). A contact closure will activate latch pullback. Upon opening of the timed or maintained contacts, the device will latch within 0.5 second. Each modified exit device contains a pulse module which delivers a pulse at approx. 24VDC to a high current coil inside the exit device every 6 seconds until the latch is finally pulled back all the way. At this point, a control rod passes over a reflective sensor and signals the module to stop pulsing. There is always an initial pulse that occurs at the moment the system is activated. During the period the system remains activated, output voltage is applied to a low current secondary coil. This coil is responsible for holding the latch in the "pulled back" position until instructed to return to the "fail secure" position. (See note 2 on page 5.) 2

3 OPERATION WITH AUTOMATIC DOOR OPERATOR The 781N is provided with two outputs (one output associated with DEVICE ONE and the other output associated with DEVICE TWO) for controlling separate automatic door operators. Each output consists of normally open relay contacts that are field wired directly to the "DOOR ACTIVATION" input of the automatic door operator. These outputs are activated within a moment after activation of their corresponding devices to allow time for the doors to be fully unlatched before automatic opening begins. Time delay pots R2 and R4 are factory set at 5 seconds, which are appropriate when using this controller with automatic door operators. When the delay times out, power is removed from the exit device and the signal to the auto door operator input is terminated, thus allowing the operator's "DOOR HOLD OPEN" delay to time out and close the door. NOTE: When using the single system latch pullback method with automatic door operator interface and both devices are being used, the operator control input must be wired to the 781N automatic door operator output for DEVICE TWO (TB3, terminals 9 and 10). OPERATION WITH FIRE ALARM The 781N can be wired to the fire alarm relay normally closed contacts. When a fire alarm occurs, any door that is currently unlatched, whether by momentary time delay or by maintained switch, will immediately latch secure. During the time that the fire alarm is active, electronic control of the automatic door opening system by wall switch, card reader, keypad, etc., is disabled. The door then can only be opened manually. The 781N comes from the factory set up for use without fire alarm interface. If the fire alarm is to be used with this controller, move the program jumper PJ2 from between the middle post and the end post, marked "FA DIS" (Fire Alarm Disabled), to between the middle post and the end post, marked "FA EN" (Fire Alarm Enabled). NOTE: The current drawn through fire alarm relay contacts will be 24VDC AUXILIARY POWER SOURCE OUTPUTS Two constant, power limited auxiliary outputs are provided for powering keypads, motion sensors, annunciator panels, electromagnetic door holders, relays, LEDs, etc. Choose between auxiliary output #1 or auxiliary output #2. Auxiliary Output #1 Range: 26.7V V, Nominal Auxiliary Output #2 Range: 12.6V V, Nominal NOTE: Both auxiliary outputs can be used at the same time for loads requiring different voltages (for a combined maximum load current of 500mA). However, do not tie the aux. output #2 ground (TB3, terminal 18) common to the aux. output #1 ground (TB3, terminal 16). Both of these power sources must be isolated from each other. CAUTION: IT IS RECOMMENDED TO USE OUTPUT #2 WITH EQUIPMENT THAT HAVE INPUTS RATED FOR VOLTS, AC OR DC. CHECK WITH THE MANUFACTURER BEFORE CONNECTING 24VDC RATED EQUIPMENT ACROSS OUTPUT #1 TO ENSURE THE HIGHER VOLTAGE WILL NOT CAUSE ANY DAMAGE. 3

4 TROUBLESHOOTING Before proceeding through the troubleshooting section, ensure that all device latches are not binding against their corresponding strikes. A bound latch can cause sluggish electric pullback or prevent pullback entirely. Power Limited Outputs All outputs to the 781N are power limited. Depending on the output, if a short circuit or an over load condition should occur, the output will either shut off entirely or go into a safe current limiting state. IMPORTANT!: THE MAXIMUM RATED LOAD FOR ALL OUTPUTS COMBINED IS 2.0 AMPS, INCLUDING 250mA (MAX.) FOR EACH AUXILIARY OUTPUT. The outputs to Device One (TB3, terminals 5 & 6) and Device Two (TB3, terminals 11 & 12) will completely shut down to 0 volts when a short circuit across the output occurs or when the load exceeds 5 amps. To reset the output, the short circuit or overload must first be located and removed. Next, momentarily switch off the outputs by opening the contacts across input terminals 1 & 2 or 7 &8, whichever is used. Before switching outputs back on, ensure the load does not exceed the maximum current ratings. Both auxiliary outputs will go into a current limiting state when the load exceeds approximately 2.0 amps or in the event of a short circuit. The current is reduced to a safe level when either of these conditions occur. The output voltage will automatically return to its normal level when the short circuit or overload condition is removed and replaced by a load falling under the maximum current rating. Neither DEVICE ONE or DEVICE TWO pulls back after the control switch is activated. 1. The power limited output to Device 1 or Device 2 (or both) may have shut down.. When this happens, the field wires that are run to the exit device are probably shorted together against the conduit, door frame or electric hinge. 2. The slow blow 4 amp fuse (Littlefuse # ) inside the exit device has blown. The most likely cause would be reversed polarity of the exit device red and black leads: RED = "+"; BLACK = "-". (Refer to the wiring diagram for proper connection.) Other possible causes may be shorted wires in the solenoid assembly or a defective pulse module. 3. An open connection in the field wiring between the power supply and control switch used for activating latch pullback. 4. A defective control switch. 5. An open connection in the field wiring between the power supply and exit device. 4

5 6. There may be no pulse. To check for pulses, prop the door open and connect a voltmeter across the red and black leads coming from the exit device (red lead is positive). Next, connect a jumper wire across terminals 1 and 2 of TB3 to keep DEVICE ONE in a continuous pulled back state. If the voltmeter measures between 30 and 40 VDC at the moment the jumper wire was installed, but the latch did not budge, then no initial pulse was generated. Check for a series of timed pulses that will occur approximately every six seconds. (Make sure that the control rod is not positioned over the reflective sensor on the pulse module when making this next check.) Wait for about 20 seconds to see if the latch pulls back. If it still does not respond, then it indicates the pulse module is inoperative and the entire solenoid/module assembly must be replaced. When 120 volts is applied to TB1, the exit devices immediately pull back, even though the control switch had not been activated. 1. Field wiring between the power supply and control switch are shorted together against the conduit or switch mounting box. 2. A maintain switch is being used and is in the closed position. 3. A defective control switch. A noticeable buzzing sound at equal intervals is coming from inside the exit device while in its pulled back state. 1. The latch is binding against its corresponding strike and preventing it from pulling back fully, due to misalignment between the latch and strike opening. 2. A defective pulse module. NOTE 1: THIS UNIT IS LISTED AS AN EXIT DEVICE CONTROL UNIT TO UL294 REQUIREMENTS. NOTE 2: THE POWER OUTPUT OF THE CONTROLLER IS OF A FAIL SECURE DESIGN. THE EXIT DEVICE REMAINS LATCHED DURING A COMPLETE POWER FAILURE, BUT ALWAYS ALLOWS FREE MECHANICAL EGRESS. LISTED PANIC HARDWARE MAY BE REQUIRED TO ALLOW EMERGENCY EXIT. CONSULT LOCAL AUTHORITY HAVING JURISDICTION. Any retrofit or other field modification to a fire rated opening can potentially impact the fire rating of the opening, and Yale Locks & Hardware makes no representations or warranties concerning what such impact may be in any specific situation. When retrofitting any portion of an existing fire rated opening, or specifying and installing a new fire-rated opening, please consult with a code specialist or local code official (Authority Having Jurisdiction) to ensure compliance with all applicable codes and ratings. Product Support Tel WIRE (9473) Yale Locks & Hardware is a division of Yale Security Inc., an ASSA ABLOY Group company. Yale is a registered trademark of Yale Security Inc., an ASSA ABLOY Group company. Other products' brand names may be trademarks or registered trademarks of their respective owners and are mentioned for reference purposes only. These materials are protected under U.S. copyright laws. All contents current at time of publication. Yale Security Inc. reserves the right to change availability of any item in this catalog, its design, construction, and/or its materials. Copyright 1998, 2013, Yale Security Inc., an ASSA ABLOY Group company. All rights reserved. Reproduction in whole or in part without the express written permission of Yale Security Inc. is prohibited. 5